package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import org.aspectj.lang.reflect.MethodSignature;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面实现公共字段填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
//    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    /**
     * 前置通知为公共字段赋值
     * @param joinPoint
     */
    @Before("autoFillPointCut()")
    public void autofill(JoinPoint joinPoint) {
        log.info("开始进行公共字段的填充...");

        // 获取到当前被拦截的操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();// 数据库操作类型

        // 获取到被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args.length == 0 || args == null) {
            return ;
        }
        Object entity = args[0];

        // 准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 根据当前不同的操作类型， 为实体的属性进行通过反射来赋值
        if(operationType == OperationType.INSERT) {
            // 四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射对属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if(operationType == OperationType.UPDATE) {
            // 两个公共字段
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射对属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

}
